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phase~1 min readUpdated 2026-06-30#phase#concurrency

Phase 04 · Concurrency & Performance II

Develops in parallel with Phase 03 and Phase 05, not before or after them. Every concept is anchored in a real bottleneck the HTTP server or the database engine actually has, measured under load.

Related notes

Low-LevelPhase 00 · OrientationWhere to start, what Atlas I you need first, and how this atlas is organized.Low-LevelPhase 01 · Warm-up BuildsShort, self-contained builds that put Atlas I's fundamentals to work.Low-LevelPhase 02 · Data & SerializationContent-addressed storage and binary serialization, with a result you'll actually use.Low-LevelPhase 03 · Networked SystemsA real HTTP/1.1 server from raw sockets — the entry point into networked systems.